When you perform a stoichiometry calculation, you are determining the ...
A) actual yield
B) theoretical yield
C) percent yield

Answer:

Molarity can be used to calculate the volume of solvent or the amount of solute. The relationship between two solutions with the same amount of moles of solute can be represented by the formula c1V1 = c2V2, where c is concentration and V is volume.

The relationship between Molarity and volume of a solution is : ( B ) They are inversely related

Molarity is the number of moles of solute in unit of volume of the solution ( usually per liter ). Molarity is calculated by dividing the number of moles of a solute ( n ) by the volume of the solution.

Molarity = n / v .

Therefore we can conclude that the relationship between Molarity and volume is that they are inversely related.

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Answer:

True

Explanation:

Answer: exothermic

Explanation: chemical reactions that release energy is called exothermic, and in this case, more energy is being released. (I THINK)

The reaction shown in the picture is exothermic reaction.

The exothermic reaction leads to the release of energy. This energy is often higher than the combined energy of the reactants.

It can be understood that the net amount of energy required to initiate an exothermic reaction is less than the net amount of energy released by the reaction. When a calorimeter, a device used to measure the heat released by a chemical reaction, the net amount of heat energy that flows through the device is equal to the negative of the total energy change of the system.

In the picture, first reactants had high energy and after the formation of the product the energy decreases.

The nuclear fission of one atom of uranium-235 releases more than 2.5 million times the energy that is produced from the combustion of coal.

The fission of one atom can cause a chain reaction in which the neutron from the fission of one uranium-235 atom can strike another atom, leading to its nuclear fission.

Therefore, The reaction shown in the picture is exothermic reaction.

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The number of reactants is less than the number of products in a decomposition reaction.

This is the type of chemical reaction which involves a reactant being broken down into two or more products.

This means the number of product is always greater than the reactant which is why option C was chosen.

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Answer:

1..CO3

2..OH

3..CO

4..Cl

5..PO3

6..SO4

8..NO3

9..NO2

1O..I2

Answer:

"Francium"

Explanation:

"Francium" is a chemical element with the symbol "Fr" and the atomic number "87". Classified as an "alkali metal", Francium is a solid at room temperature.

Atomic Mass: "223.01973u"

Year Discovered: "1939"

Answer:

240 N/m

Explanation:

Using the formula as follows:

U = ½kx²

Where;

U = elastic potential energy (J)

K = spring constant (N/m)

x = stretched displacement (m)

According to the information provided in this question,

U = 35J

x = 0.54m

k = ?

U = ½kx²

35 = ½ × k × 0.54²

35 = ½ × k × 0.2916

35 = 0.2916k/2

70 = 0.2916k

k = 70 ÷ 0.2916

k = 240.05

To 2s.f, the spring constant (k) = 240 N/m.

Answer: 240

Explanation:

Answer: Percent yield represents the ratio between what is experimentally obtained and what is theoretically calculated, multiplied by 100%.

% yield

=

actual yield

theoretical yield

⋅

100

%

So, let's say you want to do an experiment in the lab. You want to measure how much water is produced when 12.0 g of glucose (

C

6

H

12

O

6

) is burned with enough oxygen.

C

6

H

12

O

6

+

6

O

2

→

6

C

O

2

+

6

H

2

O

Since you have a

1

:

6

mole ratio between glucose and water, you can determine how much water you would get by

12.0

g glucose

⋅

1 mole glucose

180.0 g

⋅

6 moles of water

1 mole glucose

⋅

18.0 g

1 mole water

=

7.20

g

This represents your theoretical yield. If the percent yield is 100%, the actual yield will be equal to the theoretical yield. However, after you do the experiment you discover that only 6.50 g of water were produced.

Since less than what was calculated was actually produced, it means that the reaction's percent yield must be smaller than 100%. This is confirmed by

% yield

=

6.50 g

7.20 g

⋅

100

%

=

90.3

%

You can backtrack from here and find out how much glucose reacted

65.0 g of water

⋅

1 mole

18.0 g

⋅

1 mole glucose

6 moles water

⋅

180.0 g

1 mole glucose

=

10.8

g

So not all the glucose reacted, which means that oxygen was not sufficient for the reaction - it acted as a limiting reagent.

Explanation:

Answer:

Salt

Explanation:

It is because it has a defined composition.

Answer:

Salt

Explanation:

Pure substances are those that contain atoms or molecules of the same type. For eg: elements are pure (gold, hydrogen etcl.) and compounds (such as water, sodium chloride, etc.), etc.

Rest of choice are impure because they contain a mixture of different things, like pie has eggs, or all sorts of other molecules, salt water has water and salt molecules, and iced tea has water and other molecules associated with tea.

Answer:

let me know if it is right:)

and I hope it make sense

Answer: Oxygen is a gas at room temperature.

Answer:

Yes it is reduced because ocl is the reducing agent

Answer:

dragon fly larvae, beetles, fish, pelican

Explanation:

Answer:

C

Explanation:

because it is complete combustion so it will produced CO2 +H2O :)

Answer:

Mass of copper in 200 g bronze is 120 g.

Explanation:

If it is known that bronze is formed with 60% copper and 40% tin, what will be the mass of copper contained in 200 grams of bronze?

Percentage of copper in bronze = 60 %

Percentage of tin in bronze = 40 %

Mass of bronze  = 200 grams

Mass of copper in bronze = 60 % of 200 g

= 0.6 x 200 = 120 grams

Mass of copper in 200 g bronze is 120 g.  

Answer:

Global Warming , Volcanic Eruption

Answer:

ethyl methyl ether

Explanation:

when naming ethers name the alkyl rings, in this case we have methyl and ethyl( make sure they are in alphabetical order) followed by the word ether, so it becomes ethyl methyl ether

Answer:

D

Explanation:

because moles = mass /mr

so 81/18(mr of H2O=2+16)

moles =4.5

hope this helps:)

Answer:

You right!

Explanation:

Answer: Yes your right

Answer:

Surface tension causes water to form spherical droplets and allows it to support small objects, like a scrap of paper or a needle, if they are placed carefully on its surface.

>3

High surface tension is the characteristic of water which helps it form droplets.

It is the attractive force between the water molecules. Cohesion is the property of water that explains that how water molecules interact with each other that means water likes to stick to itself.        

Now lets check all options one by one:

Option (A): Low specific heat

Water has high specific heat due to the hydrogen bonding.

So, it is incorrect option.

Option (B): Non polar structure

Water molecule is polar covalent molecule because of its shape. The shape of the water molecule is bent.

So, it is incorrect option.

Option (C): High surface tension

Stronger the cohesion force then stronger the surface tension. It is responsible for the shape of the liquid droplets.

So, it is correct option.

Option (D): Ability to dissolve  substance

It has ability to form hydrogen bond which makes an water a good solvent. Water is universal solvent.

So, it is incorrect option.    

Thus, from above conclusion we can say that High surface tension is the characteristic of water which helps it form droplets.

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Answer:

d

Explanation:

As + O2 -------->as2o3

Answer:

See explanation

Explanation:

Qualitative analysis in chemistry is a method used to determine the ions present in a solution chiefly by means of chemical reactions.

In this case, I suspect the presence of silver ions and/or barium ions. The first step is to add dilute HCl. This will lead to the precipitation of the silver ion as AgCl. If a white precipitate is formed upon addition of HCl then Ag^+ is present in the solution.

Secondly, I add a carbonate such as NH4CO3(aq). This will cause the barium ions to become precipitated as barium carbonate. Hence, the formation of a white precipitate when NH4CO3(aq) is added to the solution indicates the presence of barium ion in the solution.

[tex]V_{1} = \text{5 L}[/tex]

[tex]T_{1} = \text{298 K}[/tex]

[tex]V_{2} = \text{3 L}[/tex]

[tex]T_{2}[/tex]

[tex]\dfrac{V_{1}}{T_{1}} = \dfrac{V_{2}}{T_{2}}[/tex]

[tex]T_{2} = T_{1} \times \dfrac{V_{2}}{V_{1}}[/tex]

[tex]T_{2} = \text{298 K} \times \dfrac{\text{3 L}}{\text{5 L}}[/tex]

[tex]\boxed{T_{2} = \text{179 K}}[/tex]

[tex]\\[/tex]

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Answer:

Công thức muối sắt là FeCl_3 nha bạn.

Answer:

See Explanation

Explanation:

Ionic compounds are composed of crystals. The crystal structure of an ionic compound is responsible for its hardness.

A crystalline solid contains a well organized structure which enables it to be hard and have a particular geometric shape as well defined melting point.

Hence, all the observed characteristics of NaCl are the result of its crystalline structure.

Answer:

N2 +3 H2 → 2 NH3

so we have 2180 g of N2

or 2.80 g ÷ 28.02 g/mol = 0.100 mol

1 mol of N2 react with 3 moles of H2

Therefore 0.100 mol of N2 react with 0.3 moles of H2

0.300 mol X Molar mass (2.00 g/mol) = 0.600 g

0.600 g of H[tex]_2[/tex] are needed to react with 2.80 g of  N[tex]_2[/tex].  Mole is one of the International System for Units' seven foundation units (SI).

A mole is just a measuring scale. In reality, it is one of the International System for Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. Using absolute amounts of atoms, molecules, or ions would be problematic as well since chemical reactions frequently occur at levels that use grams would be inappropriate.

A mole consists of precisely 6.022140761023 particles. The "particles" might be anything, from tiny things like electrons and atoms to enormous things like stars or elephants.

N[tex]_2[/tex] +3 H[tex]_2[/tex] → 2 NH[tex]_3[/tex]

2.80 g ÷ 28.02 g/mol = 0.100 mol of N[tex]_2[/tex]

1 mol of N[tex]_2[/tex] react with 3 moles of  H[tex]_2[/tex]

0.100 mol of  N[tex]_2[/tex] react with 0.3 moles of H[tex]_2[/tex]

0.300 mol X Molar mass (2.00 g/mol) = 0.600 g of H[tex]_2[/tex]

Therefore, 0.600 g of H[tex]_2[/tex] are needed to react with 2.80 g of  N[tex]_2[/tex].

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ANSWER 10 MOLES OF CARBON DIOXIDE

2C0 + O2 → 2CO2

2 moles of carbon monoxide forming 2 moles of carbon dioxide

10 moles of carbon monoxide will form 10 moles of carbon dioxide

Answer:

To get the molarity we need to divide the number of moles of NaCl by the volume of the solution. So, 0.32 moles NaCl divided by 3.4 L, and that gives 0.094 M NaCl.